Naturally good side appearing oddly cultured (9)
I believe the answer is:
civilised
'oddly cultured' is the definition.
'civilised' can be an answer for 'cultured' ('cultured'->'civilized' is in my internal thesaurus and 'ize'->'ise'). I'm not sure about the 'oddly' bit.
'naturally good side appearing' is the wordplay.
'naturally good' becomes 'civil' (I can't explain this - if you can you should believe this answer much more).
'appearing' is an anagram indicator.
'side' is an anagram of 'ised'.
'civil'+'ised'='CIVILISED'
Can you help me to learn more?
(Other definitions for civilised that I've seen before include "Developed, cultured" , "Socially and culturally developed" , "Polite - refined" .)